Our Team

Rejuvé is a physician-inspired clinic which offers the most advanced treatments in nonsurgical cosmetic services and skincare. Our board-certified physician and highly skilled team of licensed professionals are dedicated to providing you with the highest level of care in the world of health and aesthetics.
– John Tang, MD
– Alexandra Tang, BSN, RN
– Kim Tang, MD
– Tammy Byrnes, B.A., L.C.E
– Roslyn Warriner

John Tang, MD

“Illustrating the art of aesthetics and the enhancement of lifestyles” – Unknown

A Leader in Expertise and Knowledge in his Field

John Tang, cosmetic surgeon saratoga
Dr. John Tang is a Stanford trained, double board-certified physician practicing in Saratoga, California. His background in cosmetics, anti-aging, internal medicine, and functional medicine has given him a unique understanding of how these realms are interconnected. Dr. Tang specializes in non-invasive, non surgical aesthetic treatments weight loss, wellness, and Anti-Aging medicine.

Dr. Tang co-founded Rejuve with his wife, Alexandra Tang, RN in 2005 with the vision of providing the best and latest breakthroughs for facial rejuvenation and body enhancement in a beautiful and comfortable environment. They specialized in noninvasive aesthetic injectables like Botox, Dysport, and Kybella as well as dermal fillers like Juvéderm, Radiesse, Restylane, and Sculptra. His expertise in these injectables have earned him recognition as Presidential and Platinum Level injector for Botox/Juvederm and Dysport/Restylane/Sculptra respectively, and a Top 100 National Restylane injector. Dr. Tang also specializes in energy devices like lasers and RF energy devices like IPL, Fraxel, Ulthera, Fractora, Skinfinity, Smartxide (CO2 Laser), Venus Freeze for skin rejuvenation, skin tightening, acne scar removal, wrinkle reduction, stretch mark , laser hair removal, and tattoo removal.

He also offers body sculpting treatments such as Emsculpt Neo 1st, CoolSculpting, SculpSure, Mesotherapy and Venus Freeze. He has been honored with the prestigious CoolSculpting 1000 Award.

As the cosmetic side grew exponentially, Dr. Tang also became interested in helping patients internally to match how they were looking externally. Dr. Tang began treating conditions like perimenopause/menopause, fatigue, insomnia, irritable bowel syndrome, auto-immune disorders, hair loss, obesity, thyroid conditions, diabetes, heart disease, memory loss, and more using a holistic and functional approach with alternative and natural remedies. Dr. Tang believes in the traditional concept of listening to patients and uses a modern, functional approach to understanding and unraveling the interconnected root causes of each patient’s problems. His medical solutions are built upon trust between doctor and patient, by developing a long-term relationship and providing close and careful follow-up. These are the core concepts and lessons that Dr. Tang has learned over 20 years in practice, and with his education background in anti-aging, functional medicine, and traditional medicine.

Dr. Tang graduated Magna Cumme Laude from UC Irvine with a bachelor’s degree in Biological Sciences and a minor in Psychology. Following his undergraduate degree, he then earned his medical degree from Tufts University Medical School, where he received the Alumni Scholarship Award. He then went on to complete a three year internal medicine residency at the Kaiser Hospital and completed another three year residency in Physical Medicine and Rehabilitation at Stanford University in 2004. In 2005 he became board certified by the American Board of Physical Medicine and Rehabilitation. In pursuing more knowledge about the effects of aging, he completed a fellowship in Anti-Aging Medicine from the American Board of Anti-Aging Medicine and became board certified in Anti-Aging, Regenerative, and Metabolic Medicine in 2017. He continued to study further how to optimize longevity, both internally and externally, by completing a certification program in Molecular Efficiency and Immune System Regulation and Neurogenic, Arthritic Pain and Neurodegenerative Cellular Medicine and completing another fellowship offered by the Seeds Scientific Research and Performance (SSRP) group in cellular medicine in 2021.

Dr. Tang was named one of “America’s Top Physicians 2012” by Consumers’ Research Council of America, Global Register’s Who’s Who in 2006, and San Jose Magazine’s Top Doc in 2008. He has been cited as an expert source in news media and publications such NBC Bay Area news, the San Jose Mercury, and the Contra Costa Times.

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Alexandra Tang, BSN, RN

“Passion involves the exercise of expert skills, excellence in execution and effecting aptitudes” – Unknown

Co-Creator of the Rejuvé Treatment

In 2004, Alexandra Tang co-founded Rejuvé and helped create the Rejuvé treatment system with her husband, Dr. John Tang. Rejuvé is a unique system for creating and maintaining a harmonious state of the inner and outer body by using vitamin supplements, balancing deficient hormones through natural bio-identical hormone replacement, emphasizing proper nutrition, and creating an exercise regimen. Being a registered nurse at Rejuvé in Saratoga, California, has allowed Alexandra to utilize her knowledge, experience, and the latest in technology and innovation to help others lead healthy lifestyles centered around the aesthetics of life, personal beauty, and inner health and wellness.

Her passion for beauty and enhancement of the skin has been a major foundation of her professional career. Alexandra struggled with her own skin pigment issues and through her conquest of them she has been become an expert on Melasma in ethnic women.

Journey Through Health and Beauty
Alexandra attended San Jose State University, obtaining a Bachelor’s of Nursing. She graduated with honors and was elected into the nursing honor society of Sigma Theta Tau. She then acquired a cosmetology license based on her desire to use her training in modern medicine in a way that would bring physical beauty into the world.

She has certifications in laser hair removal, IPL/photo facials, Aluma, acoustic wave therapy, Fraxel, Exilis, Botox, Restylane, and Radiesse and is a certified injector for Botox, Dysport, Restylane, Juvederm, and Radiesse. She has also received advanced training in Botox, Dysport, Juvederm, Restylane, and Radiesse.

Her certification in Advanced Aesthetic Medicine covers chemical peels, injections of facial implants and botulinium toxin, medical cosmetology, nutrition, shapes and cellulite control, skin laser therapy, and aesthetic venous treatment.

Alexandra is a member of the American Academy of Anti-Aging, the Dermatologic Nursing Association, and the California Nursing Association.

She is well-trained in the cosmetic dermatology field and worked with Dr. Korman, a plastic surgeon in Mountain View, from 2000 to 2002, where she performed all of the laser and filler procedures for the office. Alexandra received additional training in a private dermatology office in Southern California where she learned the art of botox, sclerotherapy, skincare, and other aspects of cosmetic dermatology.

Beyond Cosmetics
Alexandra maintains her roots in nursing and healthcare by continuing to be a part of the emergency room staff at the Kaiser Foundation Hospital in Santa Clara for the last 14 years. She has worked as a Charge Nurse for 5 years in an emergency room and as a Trauma ICU nurse at Stanford. Alexandra provides quality care with ethical standards infused with a sense of humanity to promote unique excellence in physical, internal, and dermatological care.

Combining a kaleidoscope of talents with skilled capability, Alexandra has managed a multifaceted career as well as a strong family life. She is a mother of 3 boys, an artistic interior decorator, a culinary expert with a deep love for cooking, and is fluent in Spanish.

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Kim Tang, MD

Utilizing Talent with State-of-the-art Techniques
“Crafting inspiration gives life a timeless enhancement” – Unknown

In the changing world where state-of-the-art techniques are rendered with innate skills and years of dedicated study, professionals from the medical fraternity have increased and expanded their talents to include intricate modes to deliver aesthetic solutions. Transforming, identifying, and reconstructing areas that need specialized care, Dr. Kim Tang serves as a special consultant and was instrumental in the opening of Rejuvé in 2004, a physician inspired clinic that offers advanced treatments in non-surgical cosmetic services, skincare and wellness. Having been in private practice since 1996, in the fields of both general and cosmetic dermatology, Dr. Kim Tang also specializes in dermatologic surgery, performing Moh’s surgery, a highly complex form of cosmetic reconstruction surgery, to treat skin cancer patients.

Adding an innate gift of talent to her accolades, Dr. Kim Tang completed her undergraduate years where she earned her BS in Biological Sciences from UC Irvine, graduating Magna Cum Laude. She graduated from UC Irvine medical school with honors, earning membership to Alpha Omega Alpha, the highest medical honor society and completed her 3-year residency in Dermatology at the University of California, Irvine. In 1995, Dr. Kim Tang was awarded the Diplomate, American Board of Dermatology and was re-certified in 2005.

Showcasing Skill with Professionalism
Dr. Tang specializes in the art of nonsurgical facial lifts. She has been able to skillfully combine the use of lasers, botox, and dermal fillers to provide patients with a youthful and fresh experience without the risks and downtime of surgery. Her experience has earned her the distinguished recognition of being an Allergan Platinum Botox injector and her clinic is an official training site for the Lightsheer, IPL, and Aluma by the Lumenis Corporation.

Enhancing experience with excellence, Dr. Kim Tang is a Member, American Academy of Dermatology that has dedicated the services of its practicing members to excel in medical and public education, patient care, research, member service and support and professionalism. Earning the prestigious position as Member, American Society of Dermatologic Society, Dr. Kim Tang is part of an organization that is the largest dermatology specialty organization in the world. The organization also promotes, preserves, and enhances private practice of dermatology and cooperates with other organizations of similar natures that represent its members in those categories of legislative, educational, and socioeconomic areas. Dr. Kim Tang is also a Member, Orange County Dermatological Society and the American Medical Association. With over 13 years of clinical experience, Dr. Kim Tang has employed the most advanced techniques to offer the best in non surgical cosmetic treatments and skin care.

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Tammy Byrnes, B.A., L.C.E

Tammy is our Receptionist and our licensed clinical esthetician. Her love for skincare began while working for a cosmetic dermatologist and being his patient. She has over 13 years experience in the skin industry. To further her passion to help others, she received her esthetician license in 2006. Having had problem skin herself, she can relate to many of our patients and help them reach their skincare goals. She is certified in Obagi, Biomedic, La Roche Posey, Skin Medica, and Neo-Cutis and regularly attends seminars to keep up to date with the latest in medical skincare. One of her specialties is dermaplaning, a highly skilled technique, to provide immediate exfoliation for that smooth silky skin look right before that special event. She has also added a nice personal touch to our rejuvenative Facials.

In addition to her esthetician license, Tammy holds a B.A. in Psychology from San Jose State University. We are happy to have her as a part of our Rejuvé team.

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Roya Zargari

Roya Zargari is a leader in the field of Permanent Cosmetics. Roya has made the application of Permanent Cosmetics & Esthetics her specialty. She has successfully completed hundreds of procedures, and has earned the respect of many Plastic Surgeons in California. Past students, clients and health care professionals refer their patients, friends and relatives to Roya because of her caring, professional manner, eye for detail, and clinical hygienic process.

Roya is a Licensed, Certified Esthetics Instructor with advanced training in skin rejuvenation, anti-aging, and acne treatments. She is a graduate from London Metropolitan University and California State University, Sacramento with a BS in Computer Science and Mathematics. Roya is a graduate of Derma International and was certified by Derma International as a Permanent Cosmetics Instructor. Roya is a Certified Permanent Cosmetics Professional (CPCP). She is also a member of the Society of Permanent Cosmetic Professionals, (SPCP), and has been Certified as an Instructor by SPCP the largest non-profit professional association in the United States and internationally for the permanent cosmetics industry.

Roya believes in taking time with each client and/or student to fully explain and educate them about their individual permanent cosmetic procedures. She is personable, and truly passionate about her work. Roya’s goal is to consistently promote safety, excellence and professional standards by providing education, certification, and industry guidelines for each and every student.

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Anita Guerrero

Anita Guerrero is the office manager has been part of the team at Rejuve since 2007. She has over 15 years of Management experience.

She is a fan of the Rejuve skin care line, and loves how it makes her mature skin look and feel. She has also been using bio-identical hormone replacement along with a regimen of vitamins and supplements for the last 2 years to keep healthy from the inside out. She says that at the age of 52 she has not felt this good and has not had this much energy in years.

Anita enjoys supervising Rejuve, an outstanding spa, to ensure a high level of customer service and satisfaction. She loves to speak to clients, so make sure to drop her a line or say hi next time you visit.

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Roslyn Warriner

Roslyn Warriner is the newest member to join the Rejuve team and helps out with our marketing and promotional efforts. She holds a degree in Communications from San Jose State University and has run global and regional marketing campaigns for some of the top Fortune 100 companies over the past 25 years.

Roslyn has always had a fascination with skin and beauty and is passionate about empowering people to feel healthy and beautiful both inside and out. She has personally been treated with Fraxel, Botox, Restylane and Juvederm and has seen the amazing transformation of fullness and volume to her appearance.